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is a significant concern for physicians. Central) {7 d2 Z3 G* T2 a. x# Y
precocious puberty (CPP), which is mediated
& M+ ~4 C* e' p, q% [$ J# z' {through the hypothalamic pituitary gonadal axis, has
* v5 C1 H8 L3 A' D! h: Wa higher incidence of organic central nervous system; @4 ^# _) {7 W( |/ h) U
lesions in boys.1,2 Virilization in boys, as manifested
& q+ S& S S H# Rby enlargement of the penis, development of pubic
" e2 i; Q% \! Jhair, and facial acne without enlargement of testi-
- j" c( U q* N/ g. i' ncles, suggests peripheral or pseudopuberty.1-3 We; j" e$ U3 T) ~1 Z& |! J7 b
report a 16-month-old boy who presented with the6 I- B4 J' s/ i8 T- \
enlargement of the phallus and pubic hair develop-7 P; }; ~$ J H$ t& H
ment without testicular enlargement, which was due
+ ^3 U: A: d7 r6 O9 W# [to the unintentional exposure to androgen gel used by
4 d" z2 r% `1 ?3 t( W1 othe father. The family initially concealed this infor-, J* H4 w+ \( v. X
mation, resulting in an extensive work-up for this3 O4 z; j8 r0 P% g
child. Given the widespread and easy availability of D: y! Z' n8 l; E6 n) ]
testosterone gel and cream, we believe this is proba-* q8 `0 ]7 H; K
bly more common than the rare case report in the
' b3 R+ b1 m/ [/ m+ N V& Q: u4 sliterature.4
8 K6 x/ m$ [% g% o6 lPatient Report; Z+ ~/ H; d* o+ u% t! V
A 16-month-old white child was referred to the1 o9 F1 ^' Y7 S p1 e$ P4 P
endocrine clinic by his pediatrician with the concern
6 V. x8 L) Q. \8 g: D5 Iof early sexual development. His mother noticed6 }( F8 k7 v B! {) ~; S% y& D: _
light colored pubic hair development when he was
6 E) Z) @7 L' A9 S3 bFrom the 1Division of Pediatric Endocrinology, 2University of; i' X, s! o8 l
South Alabama Medical Center, Mobile, Alabama.
( { _, J" W' L4 KAddress correspondence to: Samar K. Bhowmick, MD, FACE,
: ~% y5 p0 _5 @! E8 aProfessor of Pediatrics, University of South Alabama, College of
& `$ ?8 c# u t# R0 G3 c6 F! aMedicine, 2451 Fillingim St. Mastin 212, Mobile, AL 36617-2297;
8 p& y( |+ J0 me-mail: [email protected].. F: j# t/ B. l" e
about 6 to 7 months old, which progressively became1 @ J6 B- g) R1 }% `
darker. She was also concerned about the enlarge-; w9 f2 A. A1 V
ment of his penis and frequent erections. The child. _7 m3 R' ?2 u# b3 {+ D
was the product of a full-term normal delivery, with. O" T c% ^; C8 E
a birth weight of 7 lb 14 oz, and birth length of5 z+ u0 D( I8 X7 @5 b
20 inches. He was breast-fed throughout the first year
5 S5 A A+ c, x/ n7 W: pof life and was still receiving breast milk along with
5 B9 G, _" z: J' r. C/ asolid food. He had no hospitalizations or surgery,
' ~5 c4 Z0 d$ o% X+ Hand his psychosocial and psychomotor development" i( x, [4 B K9 O/ v4 M
was age appropriate., }2 W# F0 N" X# C& V4 E9 q. t
The family history was remarkable for the father,: q3 x) j ]) v7 X! x: K
who was diagnosed with hypothyroidism at age 16,
/ f) ^! Z: M! i, H5 m r" @4 Fwhich was treated with thyroxine. The father’s
: \* j9 I4 V% G: {" T$ W$ J9 g# G# lheight was 6 feet, and he went through a somewhat
\9 _5 b+ `+ w% ~# T; q0 Oearly puberty and had stopped growing by age 14.
) c6 {: }0 N( S. B# K- `7 ]The father denied taking any other medication. The1 b( O- U# g3 g( S9 X& Q
child’s mother was in good health. Her menarche3 v- L6 \3 I$ R2 b
was at 11 years of age, and her height was at 5 feet% f+ e B, ]$ s# S1 f) }
5 inches. There was no other family history of pre-# E/ X c9 V' P; r- F7 ~; T
cocious sexual development in the first-degree rela-
" Q1 U; W1 P% ^5 `! ctives. There were no siblings.
# x9 h* x6 V8 c k0 b! KPhysical Examination
2 C0 V+ ?( l1 v5 ^& @7 aThe physical examination revealed a very active,
6 K2 W' h0 m* U3 }4 C, |% k9 X8 e( nplayful, and healthy boy. The vital signs documented. `* N, E. z% K: [0 b
a blood pressure of 85/50 mm Hg, his length was
$ P* t! w. E% Y4 t; ?# p90 cm (>97th percentile), and his weight was 14.4 kg4 _ S. V. Q, J$ s+ B I! {% l7 H
(also >97th percentile). The observed yearly growth
6 R1 O G8 v% V. j+ y- Z" g2 N* b, ovelocity was 30 cm (12 inches). The examination of
$ g2 P1 j' c" q* c+ |the neck revealed no thyroid enlargement.
# { U4 t; q- SThe genitourinary examination was remarkable for& @' T2 O9 m+ g6 D% I
enlargement of the penis, with a stretched length of
0 e' F1 _2 v- n8 cm and a width of 2 cm. The glans penis was very well
) {# k$ R5 e5 s; }+ c# ]developed. The pubic hair was Tanner II, mostly around
! @4 u' ^( {' Q5408 _0 n! h5 e: D
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the base of the phallus and was dark and curled. The2 F/ ^ `% |. y& `% s4 v
testicular volume was prepubertal at 2 mL each.
: k5 [" ^6 v2 bThe skin was moist and smooth and somewhat) U9 U5 M: C* |1 \
oily. No axillary hair was noted. There were no" s* u4 r5 k2 M5 e3 C' {) R
abnormal skin pigmentations or café-au-lait spots.
" @2 L- @/ L% r/ @# ^Neurologic evaluation showed deep tendon reflex 2+9 P! P$ R4 ^& c0 l* T5 y; N
bilateral and symmetrical. There was no suggestion
; R2 j% ]! D2 e5 |: E+ g9 H" `% @( F, vof papilledema." W L& ]( s# T! U1 w+ T
Laboratory Evaluation
9 i9 M" A1 w% X# n1 mThe bone age was consistent with 28 months by+ X5 B2 Y0 \0 u( K$ j
using the standard of Greulich and Pyle at a chrono-
/ k' u& y$ y/ S) U# C$ ^+ nlogic age of 16 months (advanced).5 Chromosomal
) a( J9 J- j( U& @9 ]9 e: ekaryotype was 46XY. The thyroid function test
0 ^, u* H y, lshowed a free T4 of 1.69 ng/dL, and thyroid stimu-
1 ` S( U1 ~" g5 S% [) Nlating hormone level was 1.3 µIU/mL (both normal).
' Q- V2 ^6 R( F% }- @' l w% CThe concentrations of serum electrolytes, blood
9 l; B5 O. l# m S D8 a l5 Ourea nitrogen, creatinine, and calcium all were# E: y/ {* f. X* v( i
within normal range for his age. The concentration# a* }5 D: s9 A0 b7 ^
of serum 17-hydroxyprogesterone was 16 ng/dL1 ]( p/ k* E8 C" t% H& [: a
(normal, 3 to 90 ng/dL), androstenedione was 20
2 C ?8 ^/ _4 W, [ng/dL (normal, 18 to 80 ng/dL), dehydroepiandros-- }' K* M* x. T# b' `
terone was 38 ng/dL (normal, 50 to 760 ng/dL),( L, g+ q$ n3 g+ S4 r
desoxycorticosterone was 4.3 ng/dL (normal, 7 to G3 p% K( A' i# C7 ~3 g- D
49ng/dL), 11-desoxycortisol (specific compound S)
- ^5 |/ G, g, |+ r. \' Qwas 43 ng/dL (normal, 10 to 156 ng/dL), serum cor-
8 [5 A+ m2 F+ }tisol was 7.6 µg/dL (normal, 2.8 to 23 µg/dL), total9 ^8 A$ ^ H. ~: B: p* V& ~
testosterone was 60 ng/dL (normal <3 to 10 ng/dL),
) Q+ R( b8 H2 j. Cand β-human chorionic gonadotropin was less than* k$ r, U8 e8 {; ^* b+ u
5 mIU/mL (normal <5 mIU/mL). Serum follicular
9 R; n9 x3 F/ L+ G0 }stimulating hormone and leuteinizing hormone
' f8 x8 p2 t5 X& X/ C& A# Y' h; ]7 }concentrations were less than 0.05 mIU/mL: D, P) }6 l+ X- Y' t
(prepubertal).
7 ]& {% s6 c0 q0 R5 N$ q+ Q7 GThe parents were notified about the laboratory% E: x0 A$ V( D: E" x/ R
results and were informed that all of the tests were
4 o* n/ I5 Q6 B! o; r- w, _normal except the testosterone level was high. The o2 u! P9 U" h: f; t
follow-up visit was arranged within a few weeks to; ^, ~; [" W' W% r e) w, q
obtain testicular and abdominal sonograms; how-0 d( {; U& _5 x" R( s4 p
ever, the family did not return for 4 months.
1 Q* ?; U. `4 _! F7 ]- KPhysical examination at this time revealed that the
6 G S x9 c. T! v$ y6 v `6 Ochild had grown 2.5 cm in 4 months and had gained% }5 |1 ]8 t3 f; c' B+ d
2 kg of weight. Physical examination remained* I1 q; u+ U# r% o. R5 l
unchanged. Surprisingly, the pubic hair almost com-
3 _$ i9 P$ l, B$ v* F2 n: @! x4 d. Qpletely disappeared except for a few vellous hairs at
7 m2 F/ r5 X2 m/ v+ H; nthe base of the phallus. Testicular volume was still 2
1 Q) p! e5 u) u. omL, and the size of the penis remained unchanged.) Z4 X D% H: X
The mother also said that the boy was no longer hav-( m3 m6 _+ R- L9 R
ing frequent erections.
. C1 B$ a9 q6 T, D9 d% M) b0 `Both parents were again questioned about use of
6 P S* ~" F& X, h" |any ointment/creams that they may have applied to
# W, I& S" b9 B6 X( Xthe child’s skin. This time the father admitted the8 [. N1 y! J- E$ F+ j- |' V" {
Topical Testosterone Exposure / Bhowmick et al 541
* \* X, j n7 h8 Vuse of testosterone gel twice daily that he was apply-
8 K8 n4 T) C* R( g3 ling over his own shoulders, chest, and back area for
6 t! \* a9 {) x# E* A$ la year. The father also revealed he was embarrassed/ j! r) G6 L4 w$ J+ u: |
to disclose that he was using a testosterone gel pre-
1 v7 a" d6 o8 Z1 b( D L; yscribed by his family physician for decreased libido/ R; C P, |7 Y/ }* N
secondary to depression.+ F8 }0 Z( u0 C2 ]& w/ a' ? I4 D
The child slept in the same bed with parents.
& K: h$ U5 G- ^. f9 S; { Q# e, \The father would hug the baby and hold him on his
# o4 H8 M9 Y, N& a* l3 i: [chest for a considerable period of time, causing sig-
" G1 K- V" {, w% K8 bnificant bare skin contact between baby and father.
, R8 M, w9 P# O! x. NThe father also admitted that after the phone call,
& s( c( ~. k, `when he learned the testosterone level in the baby, X1 c: D1 k0 h
was high, he then read the product information
( ?' i+ \% h5 X& ypacket and concluded that it was most likely the rea-
2 {% X5 z5 H# r# w& qson for the child’s virilization. At that time, they1 M. E! @3 }' v% |+ c; A
decided to put the baby in a separate bed, and the
4 _7 }! X3 G( n, M2 Sfather was not hugging him with bare skin and had' r9 R# w6 R& O9 i6 K
been using protective clothing. A repeat testosterone j0 E2 ]; b4 p) S3 r" n7 w
test was ordered, but the family did not go to the
: |: f" T) `& K; Y6 W( Ulaboratory to obtain the test.: P; r) t! ? d$ a; C2 g
Discussion
8 `, a$ p# M2 Z! B; XPrecocious puberty in boys is defined as secondary
7 Z7 h+ o$ J O; P' ?sexual development before 9 years of age.1,46 v- P/ }' d8 g& {$ r
Precocious puberty is termed as central (true) when
$ W$ \( U0 B- y" F8 C2 uit is caused by the premature activation of hypo-
6 C; ~# H7 N* u7 c9 |0 y8 tthalamic pituitary gonadal axis. CPP is more com-' H/ ^& g7 U$ P% q/ K
mon in girls than in boys.1,3 Most boys with CPP3 l8 ]% t! x+ L: t6 c9 }' T; A
may have a central nervous system lesion that is3 ~# s D/ m, D& o1 o0 c+ T* O
responsible for the early activation of the hypothal-
: {6 C: r/ B! z( Uamic pituitary gonadal axis.1-3 Thus, greater empha-+ A1 K; M: K& H. }( O/ @
sis has been given to neuroradiologic imaging in8 h& }1 ?7 C5 S4 M' Y1 p8 ~
boys with precocious puberty. In addition to viril-) o d+ N0 M7 B! Y5 l5 a/ [5 m- ]' a
ization, the clinical hallmark of CPP is the symmet-
* G' B3 y2 ?, t- Irical testicular growth secondary to stimulation by
- N% _& R) M" qgonadotropins.1,3
( S" Y" k4 q6 u" X1 RGonadotropin-independent peripheral preco-. |/ F6 k2 I0 T6 s' j4 ^
cious puberty in boys also results from inappropriate! N- j+ ~, m) A. q6 d! }. B
androgenic stimulation from either endogenous or4 A# n2 F5 ?. c' y
exogenous sources, nonpituitary gonadotropin stim-
8 ~4 p, D' ]$ c0 `+ iulation, and rare activating mutations.3 Virilizing
! v# p5 j5 b) f& ocongenital adrenal hyperplasia producing excessive
' w; z) |; H( i1 x. A' zadrenal androgens is a common cause of precocious
( K' `5 V( g7 n; T3 @/ J, S9 v4 H2 Xpuberty in boys.3,49 _2 k+ D$ `) u) ^5 U5 S
The most common form of congenital adrenal; f; T( m. A K h0 [- j2 B: |
hyperplasia is the 21-hydroxylase enzyme deficiency.6 u+ l( l8 o, ?; D3 [
The 11-β hydroxylase deficiency may also result in2 n4 D+ t+ Y0 _' i
excessive adrenal androgen production, and rarely,
/ S! q3 ]6 D/ ^, F1 j& pan adrenal tumor may also cause adrenal androgen5 ^+ f4 o7 A: d# A, x
excess.1,36 A9 ~( L/ x' v+ T ?; a
at University of Manchester Library on May 25, 2015 cpj.sagepub.com Downloaded from
+ ]8 M( Y6 l/ _4 n542 Clinical Pediatrics / Vol. 46, No. 6, July 2007" `3 I5 W E; h% V, ^0 w [
A unique entity of male-limited gonadotropin-# e$ a! K$ _! o
independent precocious puberty, which is also known
* Y; m S2 ~7 ^, Was testotoxicosis, may cause precocious puberty at a
9 Y; o) C3 x7 c0 o* mvery young age. The physical findings in these boys& |4 \9 w$ B6 ^+ F0 N
with this disorder are full pubertal development,
1 ]8 c6 P4 ?9 {7 e" \* o! Y; Dincluding bilateral testicular growth, similar to boys8 c5 Q5 J" e( G, d8 q6 V& w
with CPP. The gonadotropin levels in this disorder. N+ B1 w( Y8 h
are suppressed to prepubertal levels and do not show
2 [/ e( ~- i/ `! i0 ^" y, kpubertal response of gonadotropin after gonadotropin-
+ h% k, B. P# `4 i$ Qreleasing hormone stimulation. This is a sex-linked: G( q5 S% q. l6 a9 a& U
autosomal dominant disorder that affects only
1 k# |/ B Y7 d6 y( d4 Q3 Tmales; therefore, other male members of the family7 s$ F( V7 a* s! G* }5 |
may have similar precocious puberty.3/ V' b" ~! i6 n1 H9 f
In our patient, physical examination was incon-& G1 k' v( v4 u- k9 _2 k+ W
sistent with true precocious puberty since his testi-: g9 a7 I; _7 F
cles were prepubertal in size. However, testotoxicosis3 f8 }, u! K6 V& ]8 _
was in the differential diagnosis because his father, j; L* X8 o! x: } K6 X4 [
started puberty somewhat early, and occasionally,
2 P" ~$ w! c% @/ ztesticular enlargement is not that evident in the
" R# g) @( h$ a" W; a' c( n" nbeginning of this process.1 In the absence of a neg-
1 Q7 \" i0 j' ~- T( |6 Bative initial history of androgen exposure, our. n! b; z% S' r9 t* b
biggest concern was virilizing adrenal hyperplasia,
% t0 \, S4 _! C0 [3 P# ~; reither 21-hydroxylase deficiency or 11-β hydroxylase
! r% J/ ?6 s N- E j$ D: P/ Qdeficiency. Those diagnoses were excluded by find-
8 p! R' n2 x9 g- fing the normal level of adrenal steroids.
: q! \' `, I3 bThe diagnosis of exogenous androgens was strongly& @1 @& T- j; M2 q+ D/ Y6 D
suspected in a follow-up visit after 4 months because
6 r8 M' S0 S: n2 ^the physical examination revealed the complete disap-
- Q/ Y& i2 ]4 Q+ d1 h" u# Upearance of pubic hair, normal growth velocity, and
) W: {1 s0 M+ Z& d7 p9 idecreased erections. The father admitted using a testos-
6 \" [0 x1 K( _ J E( |terone gel, which he concealed at first visit. He was
9 S" I4 x! P& H2 Q; Jusing it rather frequently, twice a day. The Physicians’
& J" ~; v1 d. j/ P( r, xDesk Reference, or package insert of this product, gel or
5 o# n/ U% l5 H/ @3 xcream, cautions about dermal testosterone transfer to
; \ \0 J" v/ \unprotected females through direct skin exposure.0 c6 \* ^ M. @* O9 X, z
Serum testosterone level was found to be 2 times the2 U' P$ e4 U7 Q
baseline value in those females who were exposed to5 E+ A; B6 w. J+ q! G( Q& m
even 15 minutes of direct skin contact with their male G4 F' f7 V; I8 c
partners.6 However, when a shirt covered the applica-
6 i1 [/ }2 F$ ?6 p; k0 ption site, this testosterone transfer was prevented.
7 e; ~1 G' _$ L" `0 E; t) oOur patient’s testosterone level was 60 ng/mL,
1 C8 f+ R. y4 V; W" V( ]6 wwhich was clearly high. Some studies suggest that. K) p0 | S2 }. R
dermal conversion of testosterone to dihydrotestos-
; k# p% t/ r Uterone, which is a more potent metabolite, is more
' Z( y6 {" P. F: [% z( @# S, hactive in young children exposed to testosterone$ ]% L4 B) K% }' F% i
exogenously7; however, we did not measure a dihy-# [& I) {% ~& E {0 R' u# P* W
drotestosterone level in our patient. In addition to, p: h" F! a' D% N2 T
virilization, exposure to exogenous testosterone in( a6 e! i9 ?% d* S b& C W
children results in an increase in growth velocity and
! H7 V& F6 G2 Nadvanced bone age, as seen in our patient.
7 m. d6 J6 s& T( R+ IThe long-term effect of androgen exposure during0 v# y8 W/ U$ e/ t
early childhood on pubertal development and final& `6 l4 Y3 A' Z3 d: Z4 w
adult height are not fully known and always remain1 B7 w, q6 q6 {# J2 E4 R* n5 P
a concern. Children treated with short-term testos-' t) X7 H. `" P$ \! e
terone injection or topical androgen may exhibit some
7 H. y8 J) i9 p0 T2 ^acceleration of the skeletal maturation; however, after6 M1 r1 y( s0 J9 F6 r! r
cessation of treatment, the rate of bone maturation) @/ h2 s/ y' y; m; r5 ?
decelerates and gradually returns to normal.8,9- {( l# W; G) D$ }' B
There are conflicting reports and controversy! }8 N! J8 m: o2 U% }$ E. U/ ^
over the effect of early androgen exposure on adult
( }4 J8 A. r+ L/ i# ]: s4 \* ?penile length.10,11 Some reports suggest subnormal
+ D' V% E' v, @2 Dadult penile length, apparently because of downreg-
% O; b/ U$ N9 kulation of androgen receptor number.10,12 However,
! Y& S" ?6 |7 B2 TSutherland et al13 did not find a correlation between% o% N1 Y3 i1 d1 u6 {; v
childhood testosterone exposure and reduced adult
$ @/ r% {' z3 A( g2 S4 E6 g* Vpenile length in clinical studies.
2 x$ R) g1 c/ LNonetheless, we do not believe our patient is; m" |6 A4 L1 n* r6 ~
going to experience any of the untoward effects from
$ g: j" j' \" `" S \+ z! H, Atestosterone exposure as mentioned earlier because
6 [3 O# P+ m/ {# c1 `' B! Athe exposure was not for a prolonged period of time.
/ @3 {( M6 `( C% n7 p7 Y2 @Although the bone age was advanced at the time of
1 O1 h Z+ w) bdiagnosis, the child had a normal growth velocity at5 ^7 u; M0 m$ e# E) O3 A3 Q6 o
the follow-up visit. It is hoped that his final adult
- W, \ K" k. wheight will not be affected.
U9 M" |4 o' ]3 k, W; Z) VAlthough rarely reported, the widespread avail-) O+ r% W7 t+ F" d
ability of androgen products in our society may' t$ ]; |# k6 i$ l0 H
indeed cause more virilization in male or female
& s& x" q k* }8 Pchildren than one would realize. Exposure to andro-; n# t' h. T+ H( h# g S. F
gen products must be considered and specific ques-" g4 M1 W0 Y) i
tioning about the use of a testosterone product or- y" h6 B( \" k2 G: e# R6 o
gel should be asked of the family members during4 a4 T; c' G5 A4 M4 j
the evaluation of any children who present with vir-6 U6 M7 i+ n8 [; c4 Y7 `
ilization or peripheral precocious puberty. The diag-) V, i: J/ ^2 X! T6 M
nosis can be established by just a few tests and by
% C% G! s6 q- u7 |2 k# u) r2 lappropriate history. The inability to obtain such a
! T) O' D4 x4 @0 O" [history, or failure to ask the specific questions, may& [/ t; i) B; T8 B' `
result in extensive, unnecessary, and expensive
+ N+ G9 E& E. {$ linvestigation. The primary care physician should be4 V8 Q: _% v1 I9 y$ T# ?8 _7 c
aware of this fact, because most of these children
( J7 b* ~8 h* @6 w, a, `+ d& J: umay initially present in their practice. The Physicians’
: \; V3 E3 ~+ d7 j( M! CDesk Reference and package insert should also put a
$ a$ Y' ]( |7 ~- y Ewarning about the virilizing effect on a male or, @7 y7 B% e9 u+ Y1 T
female child who might come in contact with some-( m+ n/ g5 K( L3 _+ F9 ^
one using any of these products.$ ?* C* a' R. E$ H$ e0 ?! [3 V
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& l ^: d2 y- b0 q& d8. Guthrie RD, Smith DW, Graham CB. Testosterone
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